$FCD1/64721: Check Read / Write Pointer
Jump from $F624, $FACE, $FB7B, $FC30:
FCD1: 38 SEC
FCD2: A5 AC LDA $AC ; Pointer: Tape Buffer/Screen scrolling
FCD4: E5 AE SBC $AE ; Tape End Address/End of Program
FCD6: A5 AD LDA $AD ; Pointer: Tape Buffer/Screen scrolling
FCD8: E5 AF SBC $AF ; Tape End Address/End of Program
FCDA: 60 RTS
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